<template>
  <div id="app">
    <!-- 面包屑 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdBottom', index === 0 ? 'bdTop' : '']"
              v-for="(item1, index) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">
                  {{ item1.authName }}
                  <i class="el-icon-caret-right"></i>
                </el-tag>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级和三级权限 -->
                <el-row
                  :class="[index2 === 0 ? '' : 'bdTop']"
                  v-for="(item2, index2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                    >
                      {{ item2.authName }}
                      <i class="el-icon-caret-right"></i>
                    </el-tag>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                      type="warning"
                      v-for="(item3) in item2.children"
                      :key="item3.id"
                    >
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" size="mini" icon="el-icon-edit">
              编辑
            </el-button>
            <el-button type="danger" size="mini" icon="el-icon-delete">
              删除
            </el-button>
            <el-button
              @click="showSetRightDialog(scope.row)"
              type="warning"
              size="mini"
              icon="el-icon-setting"
            >
              分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDiaLogVisible"
      width="30%"
      @close="setRightDialogClose"
    >
      <!-- 树形控件 -->
      <el-tree
        ref="treeRef"
        show-checkbox
        default-expand-all
        :default-checked-keys="defKeys"
        node-key="id"
        :data="rightsList"
        :props="treeProps"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDiaLogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Roles',
  data() {
    return {
      // 所有角色列表
      rolesList: [],
      setRightDiaLogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children',
      },
      // 默认选中的树形节点数组
      defKeys: [],
      // 当前即将分配权限角色的ID
      roleId: '',
    };
  },
  created() {
    this.getRolesList();
  },
  methods: {
    // 获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles');
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败');
      }

      this.rolesList = res.data;
      console.log(this.rolesList);
    },
    async removeRightById(row, id) {
      // 弹框提示
      const confirmResult = await this.$confirm('是否删除？', '提示', {
        success: '确定',
        info: '取消',
        type: 'warning',
      }).catch(err => err);

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消');
      } else {
        const { data: res } = await this.$http.delete(
          `roles/${row.id}/rights/${id}`
        );

        if (res.meta.status !== 200) {
          return this.$message.error('删除权限失败');
        } else {
          row.children = res.data;
          return this.$message.success('删除成功');
        }
      }
    },
    // 展示分配权限的对话框
    async showSetRightDialog(row) {
      this.roleId = row.id;
      const { data: res } = await this.$http.get('rights/tree');
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限数据失败');
      } else {
        // 把获取到的权限数据保存到data中
        this.rightsList = res.data;
        // 递归获取三级节点的id
        this.getLeafKeys(row, this.defKeys);
        this.setRightDiaLogVisible = true;
      }
    },
    // 通过递归的形式获取角色下所有三级权限的ID
    getLeafKeys(node, arr) {
      if (!node.children) {
        return arr.push(node.id);
      }

      node.children.forEach(item => {
        this.getLeafKeys(item, arr);
      });
    },
    setRightDialogClose() {
      // 监听分配对话框的关闭事件
      this.defKeys = [];
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        // 拿到所有全选和半全选的数据
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys(),
      ];

      const idStr = keys.join(',');
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      );

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败');
      } else {
        this.$message.success('分配权限成功');
        this.getRolesList();
        this.setRightDiaLogVisible = false;
      }
    },
  },
};
</script>

<style lang="less" scope>
.el-tag {
  margin: 7px;
}
.bdTop {
  border-top: 1px solid #eee;
}
.bdBottom {
  border-bottom: 1px solid #eee;
}
</style>